JPS60128911A - Valve operating apparatus for engine with valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve actuation device for an internal combustion engine or other valved engine.

Valve timing in internal combustion engines has been thought to be dependent on engine speed. When using a valve system mechanically actuated by a camshaft, maximum engine power at high speed operation, minimum exhaust emissions at low speed part load operation,
Alternatively, the timing of the C1 valve is influenced by an intermediate form between the two.

Many studies have been conducted on this subject, with the conclusion that ideally it is necessary to have full control over all valve operating parameters, and that these parameters need to be varied depending on the operating conditions of the engine. Obtained. As a result of this study, various changes were proposed to the existing camshaft mounting. However, there was no proposed modification that would enable front-facing and optimal control of valve operation under all operating conditions of the engine, and the proposed modifications were merely compromises.

It is an object of the present invention to provide a valve actuation device for an internal combustion engine or other valved engine, which allows full control over all parameters of each engine valve.

According to the invention, a valve actuating device for an internal combustion engine or other valved engine consists of a piezoelectric control device and control means, the piezoelectric control device driving and controlling engine valves according to the expansion of the device. Means control the power delivered to the piezoelectric control device according to engine operating parameters.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 illustrates the mechanical valve actuation mechanism. In this figure, the piezoelectric device is labeled (1) and consists of a stack of piezoelectric discs or piezoelectric rings (2), which can be energized by means not shown. Can be done. One end of the stack of piezoelectric disks or piezoelectric rings (2) is fixed to the (3> part of the housing (4),
The other pant can move freely. At the end that can move freely, there is a carrier (7) which rotates in position (7) and is mounted on the cylinder block (9).
An actuating pin (5) is provided which engages an actuating lever arm (6) which is supported at 8°C. The part (10) of this operating lever arm (6) is connected to the pallet 7 (12).
The actuating rod (11) is connected to the actuating rod (11). Piezoelectric device (1
) is converted by the lever arm (6) into a fairly large movement to actuate the valve (12).

In this embodiment, the voltage supplied to the piezoelectric device (1) acts on the valve (12) by means of a mechanical link;
2) depends on the voltage supplied to the piezoelectric device (1).

For the sake of clarity, a motion sensor is not provided in this embodiment, but a feedback loop valve mechanism is also possible by providing a suitable sensor for sensing the motion of the valve (12).

FIG. 2 shows a second embodiment of the present invention.
the two piezoelectric devices (13, 14) generate fluid pressure;
This is controlled, and as a result, the operation of the valve (15) of the internal combustion engine is controlled. The two piezoelectric devices consist of a number of piezoelectric disks or piezoelectric rings (16, 17) - C1
This piezoelectric disk or piezoelectric ring (16, 17)
The voltage is applied by a method not shown in the figure.

One end of the stack of piezoelectric disks or piezoelectric rings (16, 17) is located at (1) of the housing < 20.21).
8, 19), and the other end can move freely.

If a piezoelectric ring is used, the piezoelectric ring can be attached to a bolt that passes through the pile of piezoelectric rings from one end to the other. At the end of the piezoelectric disk or piezoelectric ring (1fi, 17), a control ram <24
) and actuates the valve (15).
2, 23) are provided.

This control ram (24) consists of a cylinder (25) in which a valve rod (28) is arranged.
A piston (26) is provided which is carried by a rod (27) which is an extension of the piston. Connecting rod (29, 30)
are connected to the connecting rods (22, 23), respectively, and the piston (2
G) Supply and drain fluid from both sides. , [
At the end of the single rod (27), a variable resistor (31) Y'' is provided with an operating sensor shown schematically. In that the same fluid is used repeatedly - (the valve system can be closed and the connecting rod < 32.3
3) extends to the connecting rod (34, 35) and one-way pal 7
It is also possible to supply additional fluid from a storage tank (36) under control by (37, 38). These one-way valves (37, 38) can be controlled mechanically or electrically by a method not shown.

If necessary, the storage tank (36) may be pressurized.

Next, the effect will be explained.

First, a voltage is applied to a stack of piezoelectric disks or piezoelectric rings (16, 17>) (the magnitude and shape of the voltage are
(determined by the required operating parameters of the valve (15)). This voltage is converted into a longitudinal extensional motion over one stroke, moving the pressurized fluid into the control ram (
24).

The voltage can also be applied to more than one stroke of longitudinal extension to control the flow of fluid exiting the control ram (24). In this way, the working piston (26
) moves in the longitudinal direction within the cylinder (25) in response to the voltage applied to the piezoelectric wave H (13, 14>), and the valve (1
5) Open and close. Feedback of this motion is provided by a motion sensor (31), and this information is fed back to the control device to form a control loop for controlling the piezoelectric device (13, 14).

Particularly in these embodiments, it is preferred to provide a damper for engine valve actuation. The damper may be of the piston-dashpot type connected to the end of the valve actuation rod at the location of the motion sensor (31). In that case, the motion sensor (31) is moved to the appropriate position.

FIG. 5 is a block diagram of an electronic control device for operating valves of an internal combustion engine, and shows control for the piezoelectric device shown in FIGS. 1 and 2. In FIG. 5, all valves of the internal combustion engine are C-controlled by one microprocessor or computer, indicated at (91), and associated storage. In this figure, there are two groups of piezoelectric control devices (92, 92
n), each piezoelectric controller group having one (Fig. 1, 3) or two (Fig. 2) associated with a motion sensing transducer (93, 93n). A motion sensing transducer (93,
93n) is a piezoelectric feedback loop control circuit (94,
94n).

The loop control circuit (94, 94n) is connected to the high voltage intermediate plane (95
゜95n) and sends a signal to the high voltage intermediate plane (95,95n
) sends a signal to the associated piezoelectric device (92, 92n) group. The loop control circuit (94, 94n) forms a loop control system such that the motion imparted to the valve by the piezoelectric device is sensed and any deviation from correct motion is corrected by the control circuit. Furthermore, the data bus (96) is connected to a microprocessor and associated storage device (96).
Send the command from 1) to the control circuit. The microprocessor unit receives input data providing information regarding the operating status of the engine. In this embodiment, this information is input to two input terminals (97, 98).

A numerical value indicating the position of the crankshaft is input to the input terminal (91), and this numerical value can be detected by an optical sensor or a magnetic sensor. A numerical value indicating the engine load is input to the input terminal (98), and this numerical value can be detected by an optical sensor or a magnetic sensor on the load bearing wheel.

Other information input to the microprocessor includes engine speed, mixture information, inlet status, and outlet status.

The microprocessor-1 or computer is programmed to convert the information input by the input terminals (97, 98) into instructions indicating the optimum operating conditions for the valve in question. These commands are used to control each piezoelectric device (92, 92,
Adjust the loop control circuit of 92n). In this way, the output data of the PIC 4NO can indicate the timing, lift position, and speed for the actuation of the associated valve.

The microprocessor, or other function of the computer, is to control valves to produce many different effects. Ml has a wider tolerance range for the fuel-air mixture, making it easier to start the engine. Second, the engine can be used as a brake by keeping the intake stroke valve of the engine closed, facilitating wheel deceleration. Third, the lift of the inlet valve can be varied to increase the pressure drop at the suction hole.

In this way, the Reynolds number velocity of the intake mixture can be increased. Also, when the thermal efficiency of the engine increases and there is only a partial load, it is difficult to use fuel with a high air ratio. It is also possible to eliminate the need for a butterfly valve in the vaporizer and rely entirely on valve control. This piezoelectric valve actuation system can also easily accommodate the demands of turbocharger installations; i.e., in hydraulic systems, it can provide valuable cooling effects to combat the heat generated. can.

Regarding piezoelectric elements, a typical piezoelectric material is PXE5 manufactured by Philips.
results in the expansion of Each diameter is 10ml, 5ml
The use of 1 to 200 discs with a thickness of l1 or more provides suitable operating conditions for the hydraulic system illustrated in FIG. Mechanical devices such as the one shown in FIG. 1 require more sensitive piezoelectric devices to eliminate the need for larger machines.

In normal cases, operating voltages of 500 to 2000 volts can be used. The current that can be supplied to the piezoelectric device is on the order of milliamperes, and for example, the power required to drive the piezoelectric device of one engine with eight cylinders is on the order of about 1 horsepower.

Various modifications can be made to the embodiments described above without departing from the scope of the invention. For example, if direct control of the piezoelectric device is possible, the loop control circuit can be omitted. It is also possible to replace the hydraulic control with a simple pneumatic control. Instead of having a double-acting ram to actually actuate the valve, a single-acting ram with a return spring can also be installed. If hydraulic control is used, it is also possible to house all of the hydraulic control devices together at a location remote from the actuating cylinder of the valve, forming a single 11t1 functional limit.

It can be seen from the embodiments described above that a valve actuation device is provided which makes it possible to control the actuation of the valves of an internal combustion engine with respect to all operating parameters.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a valve actuation device according to the invention with a mechanical link between the piezoelectric device and the valve; FIG. 3 is a block circuit diagram of a control means circuit for controlling the piezoelectric device shown in FIGS. 1 and 2; FIG. (1) Piezoelectric device, (5) Actuation bottle, (6)
... Lever arm, (8) ... Carrier, (9)
... Cylinder block, (11) ... Operating O-rad, (12) ... Valve. Patent applicant: Ball, Julien Money, agent: Shigeru Nomura, patent attorney (How to write an amendment to an administrative procedure) 1. Case Description: Japanese Patent Application No. 58-236908 2, Title of the Invention: Valve Operating Device for Engines with Valve 3, Relationship with Person Making Amendment A'1: Patent Applicant

Claims (1)

[Scope of Claims] 1. A piezoelectric control device and a control means for controlling the electric current delivered to the piezoelectric control device in accordance with engine operating parameters, the piezoelectric control device controlling an engine valve according to the extension of the piezoelectric control device. A valve operating device for an engine with a valve, characterized in that it is adapted to be driven. 2) The apparatus of claim 1, wherein said piezoelectric control device is connected to said engine valve by a link to an enlargement machine. 3) a lever arm in which said enlarged mechanical link pivots at one end and acts on an engine valve at the other end; and said piezoelectric control device actuating means in which said lever arm engages near the pivot of said lever arm; 3. A device according to claim 2, characterized in that it comprises: 4) A fluid link having a hydraulic or pneumatic piston and cylinder arrangement directly driving the engine valve, the piezoelectric control device being connected to the fluid link. Apparatus described in section. 5) Apparatus according to claim 1, characterized in that it includes a return spring for the engine valve. 6) The first piezoelectric control device includes a first piezoelectric control device for driving the engine valve in the opening direction, and a second piezoelectric control device for driving the engine valve in the closing direction. The device according to item 1. 7) The device according to claim 1, wherein the piezoelectric control device comprises a stack of piezoelectric elements. 8) The apparatus of claim 1, further comprising a motion sensor attached to the engine valve and feeding back information for controlling the piezoelectric member. 9) The apparatus according to claim 1, wherein said control means includes a microprocessor or computer, and said engine operating data is inputted into said microprocessor or computer. 10) Claim 9, characterized in that the position of the crankshaft of the engine and the load of the engine are input to the microprocessor or computer.
Apparatus described in section.